// patterns/dynatrash/DynaTrash.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Using a Map of Lists and RTTI to automatically
// sort trash into Lists. This solution, despite
// the use of RTTI, is extensible.
// {java patterns.dynatrash.DynaTrash}
package dynatrash;

import patterns.trash.*;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Stream;

// Generic TypeMap works in any situation:
class TypeMap<T> {
    private Map<Class, List<T>> t = new HashMap<>();

    public void add(T o) {
        Class type = o.getClass();
        if (t.containsKey(type))
            t.get(type).add(o);
        else {
            List<T> v = new ArrayList<>();
            v.add(o);
            t.put(type, v);
        }
    }

    public Stream<List<T>> values() {
        return t.values().stream();
    }
}

// Adapter class for callbacks
// from ParseTrash.fillBin():
class TypeMapAdapter implements Fillable {
    TypeMap<Trash> map;

    TypeMapAdapter(TypeMap<Trash> tm) {
        map = tm;
    }

    @Override
    public void addTrash(Trash t) {
        map.add(t);
    }
}

public class DynaTrash {
    @SuppressWarnings("unchecked")
    public static void main(String[] args) {
        TypeMap<Trash> bin = new TypeMap<>();
        ParseTrash.fillBin(
                "trash", new TypeMapAdapter(bin));
        bin.values().forEach(Trash::sumValue);
    }
}
/* Output: (First and Last 10 Lines)
Loading patterns.trash.Glass
Loading patterns.trash.Paper
Loading patterns.trash.Aluminum
Loading patterns.trash.Cardboard
weight of patterns.trash.Paper = 22.0
weight of patterns.trash.Paper = 11.0
weight of patterns.trash.Paper = 88.0
weight of patterns.trash.Paper = 91.0
weight of patterns.trash.Paper = 80.0
weight of patterns.trash.Paper = 66.0
...________...________...________...________...
weight of patterns.trash.Aluminum = 81.0
weight of patterns.trash.Aluminum = 36.0
weight of patterns.trash.Aluminum = 93.0
weight of patterns.trash.Aluminum = 36.0
Total value = 860.0499778985977
weight of patterns.trash.Cardboard = 96.0
weight of patterns.trash.Cardboard = 44.0
weight of patterns.trash.Cardboard = 12.0
weight of patterns.trash.Cardboard = 22.0
Total value = 40.02000072598457
*/
